ripgrep 0.8.1

This is a patch release of ripgrep that primarily fixes regressions introduced in 0.8.0 (#820 and #824) in directory traversal on Windows. These regressions do not impact non-Windows users.

Feature enhancements:

Added or improved file type filtering for csv and VHDL.
FEATURE #798: Add underline support to termcolor and ripgrep. See documentation on the --colors flag for details.

Bug fixes:

BUG #684: Improve documentation for the --ignore-file flag.
BUG #789: Don't show (rev ) if the revision wasn't available during the build.
BUG #791: Add man page to ARM release.
BUG #797: Improve documentation for "intense" setting in termcolor.
BUG #800: Fix a bug in the ignore crate for custom ignore files. This had no impact on ripgrep.
BUG #807: Fix a bug where rg --hidden . behaved differently from rg --hidden ./.
BUG #815: Clarify a common failure mode in user guide.
BUG #820: Fixes a bug on Windows where symlinks were followed even if not requested.
BUG #824: Fix a performance regression in directory traversal on Windows.